急!请各位大神帮我解答5道小学奥数计算题,O(∩_∩)O谢谢了1.796+976×795分之796×976-7802.363+411×362分之363×411-483.567+345×566分之567×345+2224.(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)-(1/7+1/8+1/12+1/16)-(1/5+

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急!请各位大神帮我解答5道小学奥数计算题,O(∩_∩)O谢谢了1.796+976×795分之796×976-7802.363+411×362分之363×411-483.567+345×566分之567×345+2224.(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)-(1/7+1/8+1/12+1/16)-(1/5+

急!请各位大神帮我解答5道小学奥数计算题,O(∩_∩)O谢谢了1.796+976×795分之796×976-7802.363+411×362分之363×411-483.567+345×566分之567×345+2224.(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)-(1/7+1/8+1/12+1/16)-(1/5+
急!请各位大神帮我解答5道小学奥数计算题,O(∩_∩)O谢谢了
1.796+976×795分之796×976-780
2.363+411×362分之363×411-48
3.567+345×566分之567×345+222
4.(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)-(1/7+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20)
5.1+1/2+2/2+1/2+1/3+2/3+3/3+2/3+1/3+.+1/1999+2/1999+.+1998/1999+1999/1999+1998/1999+.1/1999
备注:“/”为分数线.急需计算过程,思路及结果.若有看不懂的题,请一一指出,我会努力为您解答原题.O(∩_∩)O谢谢~\(≧▽≦)/~啦
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急!请各位大神帮我解答5道小学奥数计算题,O(∩_∩)O谢谢了1.796+976×795分之796×976-7802.363+411×362分之363×411-483.567+345×566分之567×345+2224.(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)-(1/7+1/8+1/12+1/16)-(1/5+
第一题(796*976 - 180)/(796 + 976*795)
= ( 976*795 + 976 - 180) /(796 + 976*795)
= (796 + 976*795) / (796 + 976*795) = 1
第二题和第一题解法一模一样,也等于1,第三题解法也是
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20)=1/2(1+1/2+1/3+1/4)-1/3(1+1/2+1/3+1/4)+1/4(1+1/2+1/3+1/4)-1/5(1+1/2+1/3+1/4)=(1+1/2+1/3+1/4)(1/2-1/3+1/4-1/5)=(12+6+4+3)/12*(30-20+15-12)/60=25/12*13/60=65/144